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Table 3 Ranges for interpretation of I 2 following the Cochrane Handbook for Systematic Reviews of Interventions (Version 5.0.1) [23].

From: Undue reliance on I 2 in assessing heterogeneity may mislead

0% to 40% might not be important
30% to 60% may represent moderate heterogeneity
50% to 90% may represent substantial heterogeneity
75% to 100% considerable heterogeneity